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Separate default encryption and bucket policy encryption

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Default encryption (2017): https://aws.amazon.com/blogs/aws/new-amazon-s3-encryption-security-features/
Bucket policy (2016): https://aws.amazon.com/blogs/security/how-to-prevent-uploads-of-unencrypted-objects-to-amazon-s3/
This commit is contained in:
soffensive
2019-04-29 16:31:42 +02:00
parent 6dd0ab06d2
commit f5708d7db6
1 changed files with 27 additions and 21 deletions
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48
checks/check_extra734
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@@ -11,7 +11,7 @@
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
CHECK_ID_extra734="7.34"
CHECK_TITLE_extra734="[extra734] Check if S3 buckets have default encryption (SSE) enabled and policy to enforce it (Not Scored) (Not part of CIS benchmark)"
CHECK_TITLE_extra734="[extra734] Check if S3 buckets have default encryption (SSE) enabled or use a bucket policy to enforce it (Not Scored) (Not part of CIS benchmark)"
CHECK_SCORED_extra734="NOT_SCORED"
CHECK_TYPE_extra734="EXTRA"
CHECK_ALTERNATE_check734="extra734"
@@ -20,29 +20,35 @@ extra734(){
LIST_OF_BUCKETS=$($AWSCLI s3api list-buckets $PROFILE_OPT --query Buckets[*].Name --output text|xargs -n1)
if [[ $LIST_OF_BUCKETS ]]; then
for bucket in $LIST_OF_BUCKETS;do
# query to get if has encryption enabled or not
RESULT=$(echo $bucket $($AWSCLI s3api get-bucket-encryption $PROFILE_OPT --bucket $bucket --query ServerSideEncryptionConfiguration.Rules[].ApplyServerSideEncryptionByDefault[].SSEAlgorithm --output text 2>&1 | grep -v ServerSideEncryptionConfigurationNotFoundError))
TEMP_SSE_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-${bucket}.policy.XXXXXXXXXX)
# get bucket policy
$AWSCLI s3api get-bucket-policy $PROFILE_OPT --bucket $bucket --output text --query Policy > $TEMP_SSE_POLICY_FILE 2> /dev/null
# check if the S3 policy forces SSE s3:x-amz-server-side-encryption:true
CHECK_BUCKET_SSE_POLICY=$(cat $TEMP_SSE_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'| awk '/Condition/ && !skip { print } { skip = /x-amz-server-side-encryption/} '|grep \"true\")
echo "$RESULT" | while read RBUCKET SSEALG; do
# query to get if has encryption enabled or not
RESULT=$(echo $bucket $($AWSCLI s3api get-bucket-encryption $PROFILE_OPT --bucket $bucket --query ServerSideEncryptionConfiguration.Rules[].ApplyServerSideEncryptionByDefault[].SSEAlgorithm --output text 2>&1 | grep -v ServerSideEncryptionConfigurationNotFoundError))
TEMP_SSE_POLICY_FILE=$(mktemp -t prowler-${ACCOUNT_NUM}-${bucket}.policy.XXXXXXXXXX)
# get bucket policy
$AWSCLI s3api get-bucket-policy $PROFILE_OPT --bucket $bucket --output text --query Policy > $TEMP_SSE_POLICY_FILE 2> /dev/null
# check if the S3 policy forces SSE s3:x-amz-server-side-encryption:true
CHECK_BUCKET_SSE_POLICY_PRESENT=$(cat $TEMP_SSE_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'| awk '/Condition/ && !skip { print } { skip = /x-amz-server-side-encryption/} '|grep \"true\")
CHECK_BUCKET_SSE_POLICY_VALUE=$(cat $TEMP_SSE_POLICY_FILE | sed -e 's/[{}]/''/g' | awk -v k="text" '{n=split($0,a,","); for (i=1; i<=n; i++) print a[i]}'| awk '/Condition/ && !skip { print } { skip = /x-amz-server-side-encryption/} '|grep -Eo "AES256|aws:kms")
ENCRYPTION=false
echo "$RESULT" | while read RBUCKET SSEALG; do
if [[ $SSEALG ]]; then
if [[ $CHECK_BUCKET_SSE_POLICY ]]; then
textPass "Bucket $RBUCKET has SSE enabled with algorithm $SSEALG and S3 policy to enforce it"
else
# I'll leave it as Pass but to prevent uploads of unencrypted
# objects to Amazon S3 a policy to enforce it is required
textPass "Bucket $RBUCKET has SSE enabled with algorithm $SSEALG but no S3 enforcing policy found!"
fi
else
textFail "Bucket $RBUCKET has Server Side Encryption disabled!"
textPass "Bucket $RBUCKET has default encryption enabled with algorithm $SSEALG"
ENCRYPTION=true
fi
done
rm -fr $TEMP_SSE_POLICY_FILE
done
done
if [[ $CHECK_BUCKET_SSE_POLICY_PRESENT && $CHECK_BUCKET_SSE_POLICY_VALUE ]]; then
textPass "Bucket $bucket has S3 bucket policy to enforce encryption with $CHECK_BUCKET_SSE_POLICY_VALUE"
ENCRYPTION=true
fi
if [ "$ENCRYPTION" == false ]; then
textFail "Bucket $bucket does not enforce encryption!"
fi
done
rm -fr $TEMP_SSE_POLICY_FILE
else
textInfo "No S3 Buckets found"
fi
}